I am new to Apple and have recently bought an iMac. I already have a couple of Windows PCs in my home and a D-Link Wireless Router. I would like to be able to have wireless network in my home so that I can wirelessly access files on one computer's (Apple or Windows based) from another computer. I am not able to do that at present. I have also bought Apple's AIRPORT EXTREME BASE, though I have not yet opened the packet yet.
I would appreciate if somebody could advise me whether I need to have and AIRPORT EXTREME BASE or not in the presence of my D-Link Wireless Router. Basically I wish to understand what is the difference between the wireless router that I currently have and the AIRPORT EXTREME BASE that I have bought. What it is that AIRPORT EXTREME BASE can do for me that a Wireless Router can not do. Lastly I also wish to know whether I would be able to connect AIRPORT EXTREME BASE to my wireless router or not.